Are you piggy-backing the Tylenol and Motrin? If not, call your pharmacist for specific instructins, since it's been a while since I've done this. I believe you give Motrin, wait 2 hours and can dispenst the Tylenol. This way some type of pain reliever/fever reducer med. remains in her system.
The next best thing is to continue offering cold things: popsicles, VERY cold water, pedialite, jello etc...Keep some water or something she likes, cold, and in her sippy cup/bottle for her to grab whenever, and hold it for her if needed. Just don't offer milk based products if she's got the fever. The coolness will soothe her throat and help keep her hydrated. Don't worry so much about her lack of eating at this point, once she's feeling better, she'll start eating again.
If after the 48/72 hours have passed since she began the antibiotic, she doesn't seem any better, take her in for a re-check, perhaps the antibiotic isn't working on her, and a different one needs prescribed. Also, if you think she needs seen again, don't hesitate to take her back in. Better to be safe!'
It's my guess, she'll start feeling better soon. Good Luck.
M. M.